Free metal particles are an important cause of insulation failure to the gas-insulated switchgear (GIS) or the gas-insulated transmission lines (GIL), and there are few research reports that free metal particles in GIS/GIL may move and induce insulation breakdown, affected by the high voltage bus voltage and multiple frequency or occasional vibration. In this paper, a simulation model of metal particle movement in the 1100 kV GIS or GIL system is established. The charge, force and movement of free spherical metal particles under the power frequency voltage and mechanical vibration superposition was analyzed. The movement law of spherical metal particles under power frequency voltage was studied. And the influence of different vibration conditions on the movement of metal particles was obtained. Based on the movement law of metal particles, the collision momentum-flight time spectrum (CMFT) of metal particles under the superposition of power frequency voltage and vibration were extracted. The results of this study may provide a new idea for the detection and identification of free spherical metal particles in GIS/GIL. The results show that the threshold voltage of particle take-off is affected by the density and size of metal particles, the amplitude and frequency of vibration. The multiple frequency vibration amplitude can effectively increase the width of the CMFT, the maximum flight time and the maximum collision momentum. And the particle movement of materials with high collision recovery coefficients is more obvious and easier to detect. But occasional vibration has little effect on the movement of spherical metal particles. It can only affect the initial state of the particles and generate a few points to extend the spectrum.
{"title":"Simulation on Motion Characteristics of Free Metal Particles in GIS / GIL under Power Frequency Voltage and Vibration Superposition","authors":"Yufang Lv, Xiaoang Li, Jie Li, Haocheng Sun, Zhicheng Wu, Qiaogen Zhang","doi":"10.1109/ICHVE49031.2020.9279730","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279730","url":null,"abstract":"Free metal particles are an important cause of insulation failure to the gas-insulated switchgear (GIS) or the gas-insulated transmission lines (GIL), and there are few research reports that free metal particles in GIS/GIL may move and induce insulation breakdown, affected by the high voltage bus voltage and multiple frequency or occasional vibration. In this paper, a simulation model of metal particle movement in the 1100 kV GIS or GIL system is established. The charge, force and movement of free spherical metal particles under the power frequency voltage and mechanical vibration superposition was analyzed. The movement law of spherical metal particles under power frequency voltage was studied. And the influence of different vibration conditions on the movement of metal particles was obtained. Based on the movement law of metal particles, the collision momentum-flight time spectrum (CMFT) of metal particles under the superposition of power frequency voltage and vibration were extracted. The results of this study may provide a new idea for the detection and identification of free spherical metal particles in GIS/GIL. The results show that the threshold voltage of particle take-off is affected by the density and size of metal particles, the amplitude and frequency of vibration. The multiple frequency vibration amplitude can effectively increase the width of the CMFT, the maximum flight time and the maximum collision momentum. And the particle movement of materials with high collision recovery coefficients is more obvious and easier to detect. But occasional vibration has little effect on the movement of spherical metal particles. It can only affect the initial state of the particles and generate a few points to extend the spectrum.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"5 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78022437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279828
S. Wang, Jianwei Cheng, Kejie Huang, L. Bao, Junlin Zhu, W. Zhang
The characteristics of electromagnetic field for UHV-VSC converter valve are studied in this paper. The 3D electric field simulation model is established, and the indirect coupling method which takes the influence of water circuit on the overall electric field distribution into account is adopted. And the electric field distribution of the key positions of the UHV-VSC converter valve under different working conditions is calculated and evaluated, the results indicate the water circuit has some influence on the overall electrical insulation of valve tower. Besides, according to the arrangement of current carrying circuit and the material permeability of different equipment, a 3D simplified magnetic simulation model of valve tower is also set up. It was found that the material characteristic of power module shell has great influence on the overall magnetic field distribution of UHV-VSC converter valve.
{"title":"Research on the Electromagnetic Characteristics of UHV-VSC Converter Valve","authors":"S. Wang, Jianwei Cheng, Kejie Huang, L. Bao, Junlin Zhu, W. Zhang","doi":"10.1109/ICHVE49031.2020.9279828","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279828","url":null,"abstract":"The characteristics of electromagnetic field for UHV-VSC converter valve are studied in this paper. The 3D electric field simulation model is established, and the indirect coupling method which takes the influence of water circuit on the overall electric field distribution into account is adopted. And the electric field distribution of the key positions of the UHV-VSC converter valve under different working conditions is calculated and evaluated, the results indicate the water circuit has some influence on the overall electrical insulation of valve tower. Besides, according to the arrangement of current carrying circuit and the material permeability of different equipment, a 3D simplified magnetic simulation model of valve tower is also set up. It was found that the material characteristic of power module shell has great influence on the overall magnetic field distribution of UHV-VSC converter valve.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"49 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79923602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279800
Xinyi Zheng, B. Tang, Gang Liu, Huanghai Xie, Chaoyang Dai
In order to reduce the data processing of radar system and realize the real-time target recognition of wind turbines, it is necessary to find a fast solution to the scattering electric field of wind turbine blades. Aiming at the problem that the traditional electromagnetic solution algorithm needs to deal with a large amount of scattering electric field data of wind turbine blades, this paper breaks through the traditional idea of calculating electromagnetic scattering integrals in a wide area with a super-large-sized target entity as the basic unit, a method for solving the scattering electric field of a wind turbine is proposed. Based on the Undamped Exponentials (UDE) scattering center model, the Inverse Synthetic Aperture Radar (ISAR) image of wind turbine blade is constructed by Range-Doppler (R-D) algorithm. Then, using CLEAN algorithm and correlation coefficient to extract scattering center parameter set of wind turbine blade. Finally, the scattering electric field data of the scattering center is used to replace all the scattering data of the blade, and the fast solution of the scattering electric field is realized. Taking Vestas V82-1.65MW wind turbine as an example, based on the results of the moment method, the accuracy of the proposed method is 93.20%, the compression ratio of data is 76.81, and the calculation amount is 106 lower than that of the moment method.
{"title":"Scattering Electric Field Solution of Wind Turbine Blade Based on Scattering Center","authors":"Xinyi Zheng, B. Tang, Gang Liu, Huanghai Xie, Chaoyang Dai","doi":"10.1109/ICHVE49031.2020.9279800","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279800","url":null,"abstract":"In order to reduce the data processing of radar system and realize the real-time target recognition of wind turbines, it is necessary to find a fast solution to the scattering electric field of wind turbine blades. Aiming at the problem that the traditional electromagnetic solution algorithm needs to deal with a large amount of scattering electric field data of wind turbine blades, this paper breaks through the traditional idea of calculating electromagnetic scattering integrals in a wide area with a super-large-sized target entity as the basic unit, a method for solving the scattering electric field of a wind turbine is proposed. Based on the Undamped Exponentials (UDE) scattering center model, the Inverse Synthetic Aperture Radar (ISAR) image of wind turbine blade is constructed by Range-Doppler (R-D) algorithm. Then, using CLEAN algorithm and correlation coefficient to extract scattering center parameter set of wind turbine blade. Finally, the scattering electric field data of the scattering center is used to replace all the scattering data of the blade, and the fast solution of the scattering electric field is realized. Taking Vestas V82-1.65MW wind turbine as an example, based on the results of the moment method, the accuracy of the proposed method is 93.20%, the compression ratio of data is 76.81, and the calculation amount is 106 lower than that of the moment method.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"36 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80043579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dropout fuses are widely used in distribution network of 10 kilovolts for their outstanding characteristics of simple structure and convenient maintenance. However problems occur after a period of usage. Three typical failure modes of dropout fuses used in coastal area are proposed, as well as the corresponding failure mechanisms. 50 decommissioned dropout fuses from Zhoushan power grid were tested in order to study the electrical performance deterioration of dropout fuses used in coastal area, with 50 new dropout fuses set for comparison. Temperature-rise test and contact resistance measurement were carried out to evaluate electrical performance of the dropout fuses.
{"title":"Research on the Deterioration of Electrical Performance of Dropout Fuse","authors":"Jianke Zhou, Zhen Wang, Yibo Gao, Liang Feng, Bao Lv, Shaofeng Yu","doi":"10.1109/ICHVE49031.2020.9279945","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279945","url":null,"abstract":"Dropout fuses are widely used in distribution network of 10 kilovolts for their outstanding characteristics of simple structure and convenient maintenance. However problems occur after a period of usage. Three typical failure modes of dropout fuses used in coastal area are proposed, as well as the corresponding failure mechanisms. 50 decommissioned dropout fuses from Zhoushan power grid were tested in order to study the electrical performance deterioration of dropout fuses used in coastal area, with 50 new dropout fuses set for comparison. Temperature-rise test and contact resistance measurement were carried out to evaluate electrical performance of the dropout fuses.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"91 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79485585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279860
Zhengkang Yuan, Yi Tian, Xinbo Huang, Wenbo Yang, Chifeng Liu, Peng Ye
To evaluate the aging state of composite insulating materials quickly and accurately, this paper proposes a method based on polarization/depolarization current method. High polymer epoxy is selected as the research object. The UV aging test is performed on epoxy materials, and the polarization/depolarization current method is used to detect the aging state of the materials. Through the analysis of the polarization and depolarization current curve, the initial value, stable value and turning time of polarization and depolarization current are extracted as the characteristics of the aging state of the epoxy material. Comparing the polarization/depolarization current curves and their characteristic values of materials with different aging degrees, it can be found that the initial value, stable value and turning time of polarization and depolarization current are closely related to the aging degree of materials in the polarization and depolarization stages. The results show the more serious the aging of epoxy materials, the greater the polarization and depolarization current. The results show that the polarization / depolarization current method can effectively evaluate the aging characteristics of composite insulator.
{"title":"Evaluation of Aging Characteristics of Composite Insulators Based on Polarization/Depolarization Current Method","authors":"Zhengkang Yuan, Yi Tian, Xinbo Huang, Wenbo Yang, Chifeng Liu, Peng Ye","doi":"10.1109/ICHVE49031.2020.9279860","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279860","url":null,"abstract":"To evaluate the aging state of composite insulating materials quickly and accurately, this paper proposes a method based on polarization/depolarization current method. High polymer epoxy is selected as the research object. The UV aging test is performed on epoxy materials, and the polarization/depolarization current method is used to detect the aging state of the materials. Through the analysis of the polarization and depolarization current curve, the initial value, stable value and turning time of polarization and depolarization current are extracted as the characteristics of the aging state of the epoxy material. Comparing the polarization/depolarization current curves and their characteristic values of materials with different aging degrees, it can be found that the initial value, stable value and turning time of polarization and depolarization current are closely related to the aging degree of materials in the polarization and depolarization stages. The results show the more serious the aging of epoxy materials, the greater the polarization and depolarization current. The results show that the polarization / depolarization current method can effectively evaluate the aging characteristics of composite insulator.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"27 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81907818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279762
Tiaotiao Chen, Zihan Shen, Z. An, F. Zheng, Yewen Zhang
Aiming to improve the tracking and erosion resistance of the addition-cure liquid silicone rubber (LSR) without using alumina trihydrate, LSR samples with different mass fractions of fumed silica were prepared. The tracking and erosion resistance of all the samples was evaluated by the Inclined-Plane Test. The test results showed that increasing the mass fraction of fumed silica can improve the tracking and erosion resistance. The test results further showed that direct fluorination played a very important role in the improvement in tracking and erosion resistance, and the sample containing 18 phr fumed silica is able to meet the outdoor application requirements after the fluorination.
{"title":"Effect of Direct Fluorination on Tracking and Erosion Resistance of Liquid Silicone Rubber","authors":"Tiaotiao Chen, Zihan Shen, Z. An, F. Zheng, Yewen Zhang","doi":"10.1109/ICHVE49031.2020.9279762","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279762","url":null,"abstract":"Aiming to improve the tracking and erosion resistance of the addition-cure liquid silicone rubber (LSR) without using alumina trihydrate, LSR samples with different mass fractions of fumed silica were prepared. The tracking and erosion resistance of all the samples was evaluated by the Inclined-Plane Test. The test results showed that increasing the mass fraction of fumed silica can improve the tracking and erosion resistance. The test results further showed that direct fluorination played a very important role in the improvement in tracking and erosion resistance, and the sample containing 18 phr fumed silica is able to meet the outdoor application requirements after the fluorination.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"70 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84207383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279769
A. Benyoucef, L. Berquez, G. Teyssèdre, E. Aubert
The increase of on-board power in aircrafts will probably go with massive introduction of DC networks. Though voltages are much less than in power transmission cables, weight optimization implies that systems are not overdesigned. Besides, aeronautic specifications and environment stresses are more demanding. One popular cable technology uses wrapped insulation, with polyimide (PI) as inner insulation and polytetrafluoroethylene (PTFE) as outer layers, ensuring fire resistance and arc tracking resistance properties. Space charge measurements in such multilayer is more complex than in extruded cables. In order to anticipate issues with direct measurements on cables, multilayers of PI and PTFE have been investigated by pulsed electroacoustic (PEA) method. For PI, we clearly show that the fluorinated layer added onto PI to improve adhesion between rolls has a strong impact on the response. The PEA signal is influenced by the bilayer formed due to dielectric permittivity difference mainly. When associating PTFE and PI, the charge resolution within PI is further distorted due to the strong diffusivity of PTFE for acoustic waves. From the present results, difficulties forecasted for the measurement on cable materials are discussed.
{"title":"Space Charge Characterization in Insulating Materials used in Aircraft Cables","authors":"A. Benyoucef, L. Berquez, G. Teyssèdre, E. Aubert","doi":"10.1109/ICHVE49031.2020.9279769","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279769","url":null,"abstract":"The increase of on-board power in aircrafts will probably go with massive introduction of DC networks. Though voltages are much less than in power transmission cables, weight optimization implies that systems are not overdesigned. Besides, aeronautic specifications and environment stresses are more demanding. One popular cable technology uses wrapped insulation, with polyimide (PI) as inner insulation and polytetrafluoroethylene (PTFE) as outer layers, ensuring fire resistance and arc tracking resistance properties. Space charge measurements in such multilayer is more complex than in extruded cables. In order to anticipate issues with direct measurements on cables, multilayers of PI and PTFE have been investigated by pulsed electroacoustic (PEA) method. For PI, we clearly show that the fluorinated layer added onto PI to improve adhesion between rolls has a strong impact on the response. The PEA signal is influenced by the bilayer formed due to dielectric permittivity difference mainly. When associating PTFE and PI, the charge resolution within PI is further distorted due to the strong diffusivity of PTFE for acoustic waves. From the present results, difficulties forecasted for the measurement on cable materials are discussed.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"495 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84358369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9279458
E. Jin, Jiangdong Zhao, Le Zhao
Modular multi-level converters (MMC) are increasingly used in DC transmission systems, and their fast equivalent models are the basis for related research on DC transmission systems. Aiming at the shortcomings of the simulation accuracy of the traditional average equivalent model, this paper proposes a high-precision average equivalent model. The AC side uses three pairs of controlled voltage sources to equivalent the output voltage of the bridge arm. The DC side uses a controlled current source and a pair of equivalent capacitors to equivalent the capacitance of the upper and lower bridge arms, while ensuring stable power exchange between the systems. The AC side establishes a mathematical model of the controlled voltage source by ignoring the difference in the capacitor voltage of the submodule and taking into account the on-state voltage drop of the semiconductor switching device. On the DC side, the mathematical model of the equivalent capacitance of the bridge arm and the controlled current source is established by the law of conservation of energy and the introduction of the calculation method of equivalent capacitance considering the high-frequency switching of the submodule. Finally, by building a detailed model and equivalent model in PSCAD, the superiority of the equivalent model in accuracy is verified.
{"title":"Improved Precision MMC Average Equivalent Model","authors":"E. Jin, Jiangdong Zhao, Le Zhao","doi":"10.1109/ICHVE49031.2020.9279458","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279458","url":null,"abstract":"Modular multi-level converters (MMC) are increasingly used in DC transmission systems, and their fast equivalent models are the basis for related research on DC transmission systems. Aiming at the shortcomings of the simulation accuracy of the traditional average equivalent model, this paper proposes a high-precision average equivalent model. The AC side uses three pairs of controlled voltage sources to equivalent the output voltage of the bridge arm. The DC side uses a controlled current source and a pair of equivalent capacitors to equivalent the capacitance of the upper and lower bridge arms, while ensuring stable power exchange between the systems. The AC side establishes a mathematical model of the controlled voltage source by ignoring the difference in the capacitor voltage of the submodule and taking into account the on-state voltage drop of the semiconductor switching device. On the DC side, the mathematical model of the equivalent capacitance of the bridge arm and the controlled current source is established by the law of conservation of energy and the introduction of the calculation method of equivalent capacitance considering the high-frequency switching of the submodule. Finally, by building a detailed model and equivalent model in PSCAD, the superiority of the equivalent model in accuracy is verified.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"22 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84445715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The environmentally friendly C4F7N gas and its feasibility of application in switchgear are one of the hot spots in the field of electrical engineering. In this paper, a two-dimensional dynamic calculation model for 1100kV GIL high speed grounding switch(HSGS) was established based on the theory of fluid dynamics for the opening process of 1100kV GIL HSGS. By changing the type of C4F7N mixed gas in the gas chamber, the proportion of C4F7N and the basic pressure in the gas chamber, the finite element method was used to carry out arc simulation calculation on the model and the pressure, temperature and density changes of the mixed gas in the gas chamber of the HSGS were obtained. The study analyzed the effects of C4F7N mixed gas type, C4F7N ratio and base pressure of gas chamber on the arcing characteristics of HSGS. The calculation results show that increasing the pressure and the proportion of C4F7N can enhance the arc blowing effect, effectively reduce the arc channel temperature, and increase the arc channel density during arcing; Comparing the three C4F7N mixed gases, C4F7N/CO2 has the lowest arcing temperature, and the strongest arc blowing effect and the highest arc density when C4F7N accounts for 5% and 9%. When the proportion of C4F7N is 13% and 20%, C4F7N/N2 arc temperature is higher. Moreover, it has the strongest arc blowing effect and higher arc path density. C4F7N/Air has the highest arcing temperature, its blowing effect and arc channel density are lower than the other two mixed gases. The results can lay a theoretical foundation for the research of C4F7N mixed gas in arc extinction.
{"title":"Numerical Calculation and Analysis of Fluid Characteristics of Gas Chamber Environmental Protection Type 1100kV GIL HSGS during Breaking Process","authors":"Shi Liu, Xin Lin, Xiaohui Duan, Yongqi Yao, Shengwu Tan, Jia Zhang, Zhenxin Geng","doi":"10.1109/ICHVE49031.2020.9279448","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9279448","url":null,"abstract":"The environmentally friendly C<inf>4</inf>F<inf>7</inf>N gas and its feasibility of application in switchgear are one of the hot spots in the field of electrical engineering. In this paper, a two-dimensional dynamic calculation model for 1100kV GIL high speed grounding switch(HSGS) was established based on the theory of fluid dynamics for the opening process of 1100kV GIL HSGS. By changing the type of C<inf>4</inf>F<inf>7</inf>N mixed gas in the gas chamber, the proportion of C<inf>4</inf>F<inf>7</inf>N and the basic pressure in the gas chamber, the finite element method was used to carry out arc simulation calculation on the model and the pressure, temperature and density changes of the mixed gas in the gas chamber of the HSGS were obtained. The study analyzed the effects of C<inf>4</inf>F<inf>7</inf>N mixed gas type, C<inf>4</inf>F<inf>7</inf>N ratio and base pressure of gas chamber on the arcing characteristics of HSGS. The calculation results show that increasing the pressure and the proportion of C<inf>4</inf>F<inf>7</inf>N can enhance the arc blowing effect, effectively reduce the arc channel temperature, and increase the arc channel density during arcing; Comparing the three C<inf>4</inf>F<inf>7</inf>N mixed gases, C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> has the lowest arcing temperature, and the strongest arc blowing effect and the highest arc density when C<inf>4</inf>F<inf>7</inf>N accounts for 5% and 9%. When the proportion of C<inf>4</inf>F<inf>7</inf>N is 13% and 20%, C<inf>4</inf>F<inf>7</inf>N/N<inf>2</inf> arc temperature is higher. Moreover, it has the strongest arc blowing effect and higher arc path density. C<inf>4</inf>F<inf>7</inf>N/Air has the highest arcing temperature, its blowing effect and arc channel density are lower than the other two mixed gases. The results can lay a theoretical foundation for the research of C<inf>4</inf>F<inf>7</inf>N mixed gas in arc extinction.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"354 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84879996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-06DOI: 10.1109/ICHVE49031.2020.9280085
J. Li, H. Yao, H. C. Liang, Y. Chen, B. Du
Under heavy load operating conditions, the fail rate of GIL spacers will be greatly increased. Flashover fault is the most frequently occurring failures in GIL, which seriously affects the safe operation of HVDC transmission systems. This paper introduced the problem of local electric field distortion of GIL spacers under working conditions, proposes a method to uniform surface electric field by constructing a functional gradient layer on the surface of spacers. Then this paper introduced the fabrication method of FGM insulation materials, including centrifugal method, 3D printing and flexible mixed casting. Some examples are given to introduce the current research status of the construction method of the surface functional layer of the novel spacers, including multilayer impregnation, magnetron sputtering and surface fluorination. Finally, the problems that need to be solved urgently and the direction of future research and development are pointed out.
{"title":"Novel Spacer with Surface Functional Graded Materials for HVDC GIL","authors":"J. Li, H. Yao, H. C. Liang, Y. Chen, B. Du","doi":"10.1109/ICHVE49031.2020.9280085","DOIUrl":"https://doi.org/10.1109/ICHVE49031.2020.9280085","url":null,"abstract":"Under heavy load operating conditions, the fail rate of GIL spacers will be greatly increased. Flashover fault is the most frequently occurring failures in GIL, which seriously affects the safe operation of HVDC transmission systems. This paper introduced the problem of local electric field distortion of GIL spacers under working conditions, proposes a method to uniform surface electric field by constructing a functional gradient layer on the surface of spacers. Then this paper introduced the fabrication method of FGM insulation materials, including centrifugal method, 3D printing and flexible mixed casting. Some examples are given to introduce the current research status of the construction method of the surface functional layer of the novel spacers, including multilayer impregnation, magnetron sputtering and surface fluorination. Finally, the problems that need to be solved urgently and the direction of future research and development are pointed out.","PeriodicalId":6763,"journal":{"name":"2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)","volume":"29 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85492777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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